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Buck-Boost type high-power bidirectional DC/DC converter with coupled inductors

A technology of coupling inductors and converters, which is applied in the direction of converting DC power input to DC power output, output power conversion devices, current collectors, etc., to achieve high efficiency, reduce noise, and improve conversion efficiency.

Inactive Publication Date: 2015-11-11
江苏同芯电气科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this structure can solve the above-mentioned problems of the Boost type, the converter can only be used in small and medium power applications.

Method used

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  • Buck-Boost type high-power bidirectional DC/DC converter with coupled inductors
  • Buck-Boost type high-power bidirectional DC/DC converter with coupled inductors
  • Buck-Boost type high-power bidirectional DC/DC converter with coupled inductors

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Embodiment 1

[0029] From image 3 It can be seen that the circuit of the present invention is formed by parallel connection of N-way (N≥2) bidirectional Buck-Boost circuits. The circuit uses N-way coupling inductors, and the circuit structures of the DC1 side and the DC2 side of the two DC sides are completely symmetrical, that is, DC1 The voltage on the DC2 side can be higher or lower than that on the DC2 side. Therefore, the DC converter of the present invention has a wide range of applications (such as electric vehicles, battery energy storage fields). The working process of the circuit of the present invention is briefly analyzed below.

[0030] The circuit topology of the three-phase interleaved Buck-Boost bidirectional DC / DC converter is as follows: Figure 4 shown. The three-phase circuit adopts an interleaved control method, which mainly refers to the operation mode in which the carrier frequency of each phase module is the same, and the phase angles are staggered from each othe...

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Abstract

The invention discloses a Buck-Boost type bidirectional DC / DC converter with coupled inductors. The Buck-Boost type bidirectional DC / DC converter is characterized in that Buck-Boost type bidirectional DC / DC converter is composed of N paths of bidirectional Buck-Boost circuits through parallel connection, N is greater than or equal to 2 and N is a natural number. Magnetic coupled inductors are adopted to act as the inductors of all the bidirectional Buck-Boost circuits. The coupled inductors are adopted, and the inductors have multiple advantages of high differential mode current sharing inductance, great current sharing effect, small size of the device, low noise and high efficiency under the condition of the same parallel common mode inductance so that equivalent switching frequency can be enhanced, work noise and the size of the inductors can be reduced and conversion efficiency can be enhanced. Both voltage boosting and voltage reduction can be performed in the single direction of the DC / DC converter so that range of application is quite wide.

Description

technical field [0001] The invention relates to the fields of electric vehicles, supercapacitors, battery energy storage and the like, in particular to a Buck-Boost bidirectional DC / DC converter with coupled inductors. Background technique [0002] Today, with energy depletion and environmental pollution becoming more and more serious, more and more pure electric vehicles and hybrid vehicles have entered the market. However, due to the bottleneck in the development of power battery technology, the terminal voltage of the power battery for automobiles is usually designed between 180V and 720V, and the optimal DC bus voltage of the inverter is usually around 600V. In order to match the power battery voltage and the DC bus voltage , reduce the ripple current of the power battery, and improve the operating performance of the entire electric drive system. Today's pure electric and hybrid vehicles add a bidirectional DC / DC converter between the DC bus and the power battery. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02J7/00
CPCH02M3/1582H02M3/1584
Inventor 周细文谈浩楠章辉马华峰
Owner 江苏同芯电气科技有限公司
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